Evaluate the expression without using a calculator, and write your answer in radians. 
Definitions:
Marginal Product
The additional output a firm gains from employing one more unit of input, holding the levels of all other inputs constant.
Marginal Product
The increase in output that arises from an additional unit of input, holding all other inputs constant.
Factors of Production
Resources used in the production of goods and services, including labor, capital, entrepreneurship, and land.
Total Income
The aggregate amount of money earned by an individual or organization from all sources before taxes or deductions.
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